You are viewing this page in an unauthorized frame window.
This is a potential security issue, you are being redirected to
https://nvd.nist.gov
An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1, a vulnerability in Envoy's HTTP/2 downstream request processing allows an unauthenticated remote client to trigger excessive memory consumption, potentially resulting in OOM termination of the Envoy process and denial of service. The issue arises from the combination of two behaviors. First, cookie header bytes are not fully accounted for during request header size validation in Envoy. Second, HPACK header block limits in oghttp2/quiche are enforced on encoded bytes without a corresponding limit on total decoded header size. Together, these behaviors allow a malicious client to cause large decoded header allocations while bypassing the intended request header size protections. Versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1 contain a fix. No complete workaround is known short of applying a fix. Possible temporary mitigations include disabling downstream HTTP/2 where operationally feasible; enforcing stricter request header and cookie limits before traffic reaches Envoy; and monitoring Envoy memory usage for abnormal growth under HTTP/2 traffic.
Metrics
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
By selecting these links, you will be leaving NIST webspace.
We have provided these links to other web sites because they
may have information that would be of interest to you. No
inferences should be drawn on account of other sites being
referenced, or not, from this page. There may be other web
sites that are more appropriate for your purpose. NIST does
not necessarily endorse the views expressed, or concur with
the facts presented on these sites. Further, NIST does not
endorse any commercial products that may be mentioned on
these sites. Please address comments about this page to [email protected].
OR
*cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions up to (excluding) 1.35.11
*cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions from (including) 1.36.0 up to (excluding) 1.36.7
*cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions from (including) 1.37.0 up to (excluding) 1.37.3
*cpe:2.3:a:envoyproxy:envoy:1.38.0:*:*:*:*:*:*:*
Added
CPE Configuration
OR
*cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:* versions from (including) 2.6 up to (excluding) 2.6.17
*cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:* versions from (including) 3.0 up to (excluding) 3.0.12
*cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:* versions from (including) 3.1 up to (excluding) 3.1.9
*cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:* versions from (including) 3.2 up to (excluding) 3.2.6
*cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:* versions from (including) 3.3 up to (excluding) 3.3.4
Added
Reference Type
CVE: http://www.openwall.com/lists/oss-security/2026/06/04/15 Types: Mailing List, Mitigation, Third Party Advisory
[{"vendor":"Red Hat","product":"Red Hat OpenShift Service Mesh 2.6","defaultStatus":"affected","cpes":["cpe:/a:redhat:service_mesh:2.6::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Service Mesh 3.0","defaultStatus":"affected","cpes":["cpe:/a:redhat:service_mesh:3.0::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Service Mesh 3.1","defaultStatus":"affected","cpes":["cpe:/a:redhat:service_mesh:3.1::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Service Mesh 3.2","defaultStatus":"affected","cpes":["cpe:/a:redhat:service_mesh:3.2::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Service Mesh 3.3","defaultStatus":"affected","cpes":["cpe:/a:redhat:service_mesh:3.3::el9"]}]
New CVE Received from GitHub, Inc.6/17/2026 2:18:02 PM
Action
Type
Old Value
New Value
Added
Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1, a vulnerability in Envoy's HTTP/2 downstream request processing allows an unauthenticated remote client to trigger excessive memory consumption, potentially resulting in OOM termination of the Envoy process and denial of service. The issue arises from the combination of two behaviors. First, cookie header bytes are not fully accounted for during request header size validation in Envoy. Second, HPACK header block limits in oghttp2/quiche are enforced on encoded bytes without a corresponding limit on total decoded header size. Together, these behaviors allow a malicious client to cause large decoded header allocations while bypassing the intended request header size protections. Versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1 contain a fix. No complete workaround is known short of applying a fix. Possible temporary mitigations include disabling downstream HTTP/2 where operationally feasible; enforcing stricter request header and cookie limits before traffic reaches Envoy; and monitoring Envoy memory usage for abnormal growth under HTTP/2 traffic.
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
